Is it possible to insulate a house made of aerated concrete with foam plastic? A friend opened the foam after 3 years (the result of insulation)

A popular building material - aerated concrete is ranked among the groups of aerated concrete. There are 3 types (gas silicate, foam concrete and aerated concrete). These materials have a high ability to maintain temperature. The pores in the structure of materials contain air, which serves as a heat insulator.

Aerated concrete is a safe material, does not emit harmful substances. Ease of installation, speed of construction, lightness, low load on the foundation - these are not all the advantages of the blocks.

Will the aerated concrete house freeze through and should it be insulated?

Some builders claim that if the aerated concrete is not insulated, the walls will freeze through. Water will accumulate in the pores of the material and freeze inside. In warm weather, melt and destroy gas blocks.

Now many people choose polystyrene as insulation. As for the penoplex, they can also insulate the walls from the aerated block, but there is such a nuance. It will be necessary to additionally make a high-quality vapor barrier of the walls from the inside. If not, the walls will begin to damp, dampness and mold will appear inside the house.

Foam insulation has the following advantages:

• Beautiful and durable facade,
• The cost of heating the house is reduced,
• Good sound insulation,
• You can insulate at any stage.

The thickness of the insulation should be matched to the thickness and structure of the walls of the building. For example, the walls of a half-brick house will require a greater thickness of insulation. What matters is the quality of the glue and special fasteners for the foam.

A friend has a house made of aerated concrete 200 mm. He insulated with foam on all sides 50 mm. On the north side, insulation is 100 mm. After 3 years, I decided to see what was happening under the foam. Tore off a piece from the side where there is a lot of humidity in the house (bathroom). I saw that there was no moisture, especially no mold. There is no equipped ventilation in the house, they just open the micro windows for ventilation. All rooms have high humidity (sometimes above 50%). The house is heated only with warm floors.

Why is he doing well and there is no moisture, dampness and mold behind the insulation? I think that in the area where he lives there are no severe frosts (up to 40 grams). The house stood with him without insulation for about 5 months, the gas block was dry enough. In addition, the fixing was done correctly and the joints between the foam were propeneted.

If you make such insulation, where frosts are from 25-40 degrees and foam is thinner, and even glued to a damp block with gaps, then there may be problems. If there is a gap, then the zero dew point will be there. It is necessary to glue the foam close, try to keep the walls and insulation as a whole.